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Environmental Science: Earth as a Living Planet, 7th Edition
Daniel B. Botkin,
George Mason Univ., and The Center for the Study of the Environment, Santa Barbara, California
Edward A. Keller,
Univ. of California, Santa Barbara
ISBN 978-0-470-11855-9, ©2010, 800 pages
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Environmental Science: Earth as a Living Planet, 6th Edition

Daniel B. Botkin,
University of California - Santa Barbara
Edward A. Keller,
Univ. of California, Santa Barbara
ISBN 978-0-470-04990-7, ©2007, 768 pages
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